Attachment-plug.



P. D'. PHILLTPS.

ATTACHMENT PLUG.

APPLICATION man MAY12.'19|3.

Paten'd Aug. 7, 1917.

2 SHEETS-SHEET l.

' P." u. PHILLIPS;

ATTACHMENT PLUG.

APPLICATION FILED MAY T2, T913. Lm Patentedfmg. 7,1917.

2 SHEETS-SHEET 2.

:PAUL D. PHILLIPS,- OF CHICAGO, ILLINOIS, ASSGBIOR T0 BENJ' f uro..

COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION" OFILLIN'OIS.

ATTACHMENT-PLUG.

nascere. l

Specification of Letters Patent.

Patented Aug. '7, 191'?.

Application ledlay 12, 1913. Serial No. 767,049.

To all whom t may concern:

Beit known that I, PAUL D.

a citizen of the United States, residin at Chicago, in the county ofCook and tate of Illinois, have invented new and useful Im-v PHILLIPS,

provements in Attachment-Plugs, of which the following is', a full,clear, concise, and exact description, reference being had to theinvention to lmprove upon'the construction of the threaded contacts ofattachnmentv plugs, and to provide anveective and economical `manner yofsecuring insulating thumb rings to such contacts.

An embodiment of my invention, as applied to a separable attachment plughaving .a rotatable threaded Contact on the insertible portion thereof,is described, by way ofexample, inthe following specication and showninthe accompanying drawings. It is to be understood, however, that theinvention maybe applied to other types of plug than that described andshown,l and that changes may be made in the emb0d1- ment which Ihavechosen as illustrating my invention, without exceeding the scope of.the invention, as -dened in the appended claims. Y

In the drawings;

Figure 1 is a longitudinal section through a-separable attachment plugconstructed in accordance with an invention;

. Fig. 2: is a section on the line 2-j-2 of Fig. 1, looking in thedirectionof the arrows; l. 0

Fig. 3v is a top plan of the insertible Fig. 8 is a perspective detailview of one of the forked contactsA of the insertible portion;` and Fig.9 is a perspective detail view of one of the plunger contacts of thebinding-terminal carrying portion.

Like reference characters refer to like Iparts'throughout the followingspecification and the several gures of the accompanying drawings.

,Referring now particularly to Figs. 1-5 and Fig. 8, the insertibleportion of the plug includes an insulating base 10 having, at its lowerend, an enlargement 11, the upper surface of which enlargement forms ashoulder 12. The base l0 has formed therein a pair of chambers 13containing forked connecting contacts 14s, such contacts being held inplace by means of screws 15 and 16, re-

spectively', passing longitudinally through the base. The forkedcontacts 14 are formed with surface threads on their inner sides, whichthreads are engaged by the screws 15 and 16. The forked contacts fitclosely within the chambers, 13, which enables them to be securelyretained in position in thismanner. The center contact, 17, of the plugis clamped against the upper end of the base 10 by'the head of the screw16, such center contact thus Vbeing in electrical connection with one ofthe forked connecting contacts 14.

Rotatably mounted on the base 10 is a threaded contact, which comprisesa metallic threaded shell 18 having, at its upper end, an.inwardly-extending Harige 19 the edge of which slidingly embraces thetop end oi" the base 10. At its lower end, the shell 18 is formed with alongitudinally uted neck 20 which engages within an upwardly extendingflange 21 of an insulating thumb ring 22. The inside of the ange 21 islongitudinally fluted in a manner corresponding to that in which theneck 20 is Fluted, so that a rm non-rotatable mechanical connection isestablished between the shell -18 and the thumb rin 22. The thumb ring22 is formed wit an inwardly extending annular collar 23,. on the topface of which the neck 20 of the shell 18 rests.

The collar 23 slid- 100 ingly embraces the base 10, and slidingly restsupon the shoulder 12 ofthe extension 11 of the base 10. Longitudinalwithdrawal of the threaded contact from the base is prevented by meansof a metallic disk 24 which lies upon the upper end of the base 10,being clamped in position by the screw 15. The edge of the disk 24slidingly engages the top surface of the ange 19 ofthe shell 18, therebypreventing withdrawal of the threaded contact and establishingelectrical connection between the latter and the second forkedconnecting contact 14.

My improved construction of `threaded contact, in which a non-circularportion of the shell coperates with a corresponding non-circular portionof the thumb ring is exceedinglyeconomical of construction, and doesavv-ay with the `expensive molding and other connecting operations whichhave heretofore been resorted to in connecting the shell with the thumbring. In the embodiment of my invention which I have described,the'thumb ring maybe formed by the ordinary pressin operation, and theshell maybe formed y a 'simple spinning and stamping operation. All.that is then necessary is to press the shell into the thumb ring. Thefit of the parts is close enough to prevent any undesirable play'between them; and accidental removal of the shell from the thumb ringis efectually prevented by reason of the engagement of the collar 23 ofthe-thumb ring with the shoulder 12 and the engagement of the iange 19of the shell with the disk 24.

The insertible portion of the plug includes a base 25, having secured tothe upper surface thereof a pairof binding plates 26. These bindingplates are bent at right angles so as to form a pair of plunger contacts27, each of which engages one of the forked contacts 13. The plungercontacts 27 are,

formed with internally threaded slots 28 at their lower parts, whichslots receive cap screws 29 which pass upwardly through the base 25(Figs. 1, 2, 6 and 9). The binding plates 26 lie snugly incorrespondingly shaped depressions 30- formed in the top surface of thebase 10, so that the screws 29, entering the slots 28 as describedabove, are suflicient to retain the binding plates firmly in position.'Conductors are led to the binding plates 26 through apertures 31 formedlongitudinally throughthe base, and are clamped against withdrawal bymeans of a conductor-gripping bushing 32, whereby the binding plates arerelieved from alll strain.

Having thu's fully described my invention, what I claim as new anddesire to secure by Letters Patent is:

1. An attachment plug comprising, the combination with an insulatingbase, of a restrain threaded contact rotatably mounted on said base, 'aninsulating thumb ring, said ring and contact having inter-engaging meansfreely engagea'ble and disengageable by relative longitudinal movementbut preventing their relative rotation, and means engaging said contactand rin to preventtheir disengagement by relative lbngitu'dinalnievement, comprising an abutment supported by said base adjacent theentering end of the plug'engaging the threaded Contact.

2. An attachment plug comprising, the combination with an insulatingbase, of a threadedcontact rotatably mounted on said base, aninsulatingl thumbring, said ring and contact having inter-engaginglongitudinal corrugations freely engageable and disengageable byrelative longitudinal movement Ibut preventing their relative rotation,and means engaging said contact and ring to prevent their disengagementby relative longitudinal movement comprisin an abutment supported bysaid Abase adjacent the entering end -of the plug engaging the threadedcontact. j 3. An attachment plug comprising the combination with aninsulating base, of a threaded contact rotatably mounted on said base,an insulating thumb ring, said ring and contact having interengagingmeans freely engageable and disengageable by relative longitudinalmovement but preventing their relative rotation, and means en aging saidcontact and rin to prevent their disengagement 'by relative longitudinalmovement comprising an abutment of conducting material supported by saidbase adjacent the entering end of the plug engaging the v threadedcontact, and an electrical contact electrically connected withsaid-abutment.

4:. lAn attachment lplug comprising the combination with an insulatingbase, of a threaded contact rotatably mounted on said base, aninsulating thumb ring, said ring and contact having interengaging meansfreely engageable and disengageable by relative longitudinal movementbut preventing their relative rotation, and means engaging said contactand rin to prevent their disengagement by relative longitudinalmovement, comprising a flange supported by said base adjacent theentering end of the plug engaging the threaded contact.

5. An attachment plug comprising the combination with an insulatingbase, of av threaded contact rotatably mounted on said base, aninsulating thumb ring, said ring and contact being sleeved one u p onthe other and freely engageable and isengageable from each other'byrelative longitudinal movement, interengagingmeans on said ring andcontact brought into engagement fwhen the ring and contact are assembledfor preventing relative rotation therebe- In witness whereof, I havehereunto subscribed my name in the presence of two wit- DQSSES.

PAUL D. PHLLPS. Witnesses M. J. CLEARY,

mi M. N.

